Lucy Letby allegedly murdered three other babies, according to one of the main witnesses in her trial.
Letby, 33, became Britain’s worst child killer when she was convicted of murdering seven infants and attempting to murder six others.
Yesterday, Dr Dewi Evans, an expert accredited by the National Crime Agency, raised further concerns over the deaths of several children not included in the prosecution.
Appearing on the Daily Mail’s Lucy Letby Trial podcast, he said: “Initially I looked at 32 cases and seven of them (which were not part of the trial) require further examination.
“These babies suffered from life-threatening illnesses and three of them died – but we need to examine them to see if they were also put at risk.
“They were in poor health, so it may be impossible to demonstrate beyond a reasonable doubt whether they were harmed.”
Letby will spend the rest of his life in prison without any chance of parole.
She is the fourth female defendant in British history to face a life sentence.
Dr Evans told the podcast he also suspected Letby could have harmed 10 other babies.
He added: “I found several very suspicious cases where an endotracheal tube – placed in a baby’s throat when they need breathing assistance – had been misplaced and had come out. »
“These tubes can come out accidentally, but for so many to come out is very, very unusual, especially in what I consider a good unit.” “I suspect these tubes were moved intentionally.
“Of those 18, there could be as many as ten babies who have been placed in harm’s way.”
Last week, the former neonatal nurse began an attempt to have her conviction overturned.
She has made a formal application for permission to appeal the decision at Manchester Crown Court.